Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752880AbdHROEn (ORCPT ); Fri, 18 Aug 2017 10:04:43 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:4075 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752141AbdHROBE (ORCPT ); Fri, 18 Aug 2017 10:01:04 -0400 From: Dongjiu Geng To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , Subject: [PATCH v11 6/6] target-arm: kvm64: Handle SError interrupt for the guest OS Date: Fri, 18 Aug 2017 22:23:47 +0800 Message-ID: <1503066227-18251-7-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1503066227-18251-1-git-send-email-gengdongjiu@huawei.com> References: <1503066227-18251-1-git-send-email-gengdongjiu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.187.203] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0207.5996F310.019D,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: a2fc3c2d8f4dd5ae8c41d992041e0951 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3952 Lines: 106 When guest OS happens SError interrupt(SEI), it will trap to host. Host firstly calls memory failure to deal with this error and decide whether it needs to deliver SIGBUS signal to userspace. The advantage that using signal to notify is that it can make the notification method is general, non-KVM user can also use it. when userspace gets this signal and knows this is SError interrupt, it will translate the delivered host VA to PA and record this PA to GHES. Because ARMv8.2 adds an extension to RAS to allow system software insert implicit Error Synchronization Barrier operations to isolate the error and allow passes specified syndrome to guest OS, so after record the CPER, user space calls IOCTL to pass a specified syndrome to KVM, then switch to guest OS, guest OS can use the recorded CPER record and syndrome information to do the recovery. The steps are shown below: 1. translate the host VA to guest OS PA and record this error PA to HEST table. 2. set specified virtual SError syndrome and pass the value to KVM. Signed-off-by: Dongjiu Geng Signed-off-by: Quanming Wu --- linux-headers/linux/kvm.h | 1 + target/arm/internals.h | 1 + target/arm/kvm64.c | 28 ++++++++++++++++++++++++++++ 3 files changed, 30 insertions(+) diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h index 2aa176e..10dfcab 100644 --- a/linux-headers/linux/kvm.h +++ b/linux-headers/linux/kvm.h @@ -1356,6 +1356,7 @@ struct kvm_s390_ucas_mapping { /* Available with KVM_CAP_S390_CMMA_MIGRATION */ #define KVM_S390_GET_CMMA_BITS _IOWR(KVMIO, 0xb8, struct kvm_s390_cmma_log) #define KVM_S390_SET_CMMA_BITS _IOW(KVMIO, 0xb9, struct kvm_s390_cmma_log) +#define KVM_ARM_SEI _IO(KVMIO, 0xb10) #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) diff --git a/target/arm/internals.h b/target/arm/internals.h index fc0ad6d..18b1cbc 100644 --- a/target/arm/internals.h +++ b/target/arm/internals.h @@ -237,6 +237,7 @@ enum arm_exception_class { #define ARM_EL_ISV (1 << ARM_EL_ISV_SHIFT) #define ARM_EL_EC_MASK ((0x3F) << ARM_EL_EC_SHIFT) #define ARM_EL_FSC_TYPE (0x3C) +#define ARM_EL_ISS_MASK ((1 << ARM_EL_IL_SHIFT) - 1) #define FSC_SEA (0x10) #define FSC_SEA_TTW0 (0x14) diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index d3bdab2..b84cb49 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -616,6 +616,22 @@ static int kvm_arm_cpreg_value(ARMCPU *cpu, ptrdiff_t fieldoffset) return -EINVAL; } +static int kvm_inject_arm_sei(CPUState *cs) +{ + ARMCPU *cpu = ARM_CPU(cs); + CPUARMState *env = &cpu->env; + + unsigned long syndrome = env->exception.vaddress; + /* set virtual SError syndrome */ + if (arm_feature(env, ARM_FEATURE_RAS_EXTENSION)) { + syndrome = syndrome & ARM_EL_ISS_MASK; + } else { + syndrome = 0; + } + + return kvm_vcpu_ioctl(CPU(cpu), KVM_ARM_SEI, &syndrome); +} + /* Inject synchronous external abort */ static int kvm_inject_arm_sea(CPUState *c) { @@ -1007,6 +1023,15 @@ static bool is_abort_sea(unsigned long syndrome) } } +static bool is_abort_sei(unsigned long syndrome) +{ + uint8_t ec = ((syndrome & ARM_EL_EC_MASK) >> ARM_EL_EC_SHIFT); + if ((ec != EC_SERROR)) + return false; + else + return true; +} + void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr) { ram_addr_t ram_addr; @@ -1024,6 +1049,9 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr) if (is_abort_sea(env->exception.syndrome)) { ghes_update_guest(ACPI_HEST_NOTIFY_SEA, paddr); kvm_inject_arm_sea(c); + } else if (is_abort_sei(env->exception.syndrome)) { + ghes_update_guest(ACPI_HEST_NOTIFY_SEI, paddr); + kvm_inject_arm_sei(c); } return; } -- 1.8.3.1